Jeio
Daily close in US$ at the latest USD/KRW close. Source: KRX via FinanceDataReader.
Jeio makes carbon nanotubes, ultra-fine carbon-based materials used as conductive additives inside rechargeable batteries to improve electrical performance, and supplies them to major battery makers in Korea and abroad.
The company also provides plant-engineering services, covering process design, project management, and commissioning for industries such as battery materials, electronics, petrochemicals, and environmental processing. Listed on KOSDAQ, Korea's tech-focused small-cap exchange, Jeio operates two distinct business lines: battery-materials production and industrial plant engineering.
Summary is AI-generated and may contain errors · figures from DART filings
Jeio states it was the first company in Korea to achieve mass production of carbon nanotubes and that it developed its own production equipment in-house.
Jeio in five facts
What does Jeio do?
Jeio makes carbon nanotubes, ultra-fine carbon-based materials used as conductive additives inside rechargeable batteries to improve electrical performance, and supplies them to major battery makers in Korea and abroad.
Where is Jeio listed and in which sector?
Jeio (Korean name: 제이오) trades under KRX code 418550 on KOSDAQ, the Korea Exchange's board for smaller and growth companies. It is classified in the Industrials sector, Construction & Engineering.
How large is Jeio?
Its market capitalisation was US$114.8M on 2026-10-21, which puts it in this site's small-cap group. US$ amounts are converted from won at 1 USD ≈ ₩1,325 (2026-10-21).
What were Jeio's latest annual revenue and operating profit?
For fiscal year 2025, Jeio reported revenue of US$41.6M, an operating loss of US$3.2M and a net loss of US$5.6M, per its annual report on DART (data retrieved from DART on 2026-06-04). Revenue was down 33.4% on the previous year.
Where does this data come from?
Financial statements and filings come from DART, Korea's official corporate-filing system. Share prices, market capitalisation and trading status come from KRX. Company summaries are AI-generated from the filings and may contain errors; financial figures are mapped directly from DART.
Data sources and last updated
- Filings and financial statements
- DART (dart.fss.or.kr), Korea's official corporate-filing system
- Prices, market cap, trading status
- KRX (Korea Exchange), via FinanceDataReader
- Latest annual financials
- Fiscal year 2025, data retrieved from DART on 2026-06-04
- Share price and market cap
- Close of 2026-10-21
- Currency
- US$, converted from won at 1 USD ≈ ₩1,325 (2026-10-21 close)
- Company data updated
- 2026-10-21
- Company summary
- AI-generated from filings; may contain errors. Information only, not investment advice.
- [Amended] Supply contract signed
Jeio updated a previously disclosed supply contract with JC Chemical, now worth US$6.87M, about 18.3% of its recent annual revenue, running through Feb 2027.
Supply contract · Apr 20 · 2 versions - [Amended] Supply contract signed
Jeio updated a previously disclosed supply contract with ECOPRO BM HUNGARY Zrt., now worth US$35.7M, about 68.15% of its recent annual revenue, running through Apr 2026.
Supply contract · Mar 26 - [Amended] Change of 30% or more in revenue or profit/loss structure (15% for large companies)
Jeio updated its previously filed consolidated results for FY2025: revenue of US$36.7M (−33.4% year on year), an operating loss of US$2.82M and a net loss of US$4.96M.
Earnings · Mar 16 · 2 versions